Core-making machine.



No. 673,795. Patented May 7, l90l. J. L. HAMMER.

CORE MAKING MACHINE.

(Application led Apr. 25, 1900.)

(No Model.)

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llrrn Srnrns ArnT FFICE JOHN L. HAMMER, OF CHICAGO, ILLINOIS, ASSIGNOR TO EDWIN F. BROWN, OF SAME PLACE.

CORE-MAKING MACHINE.

SPECIFICATION forming part of Letters Patent No. 673,795, dated May 7, 1901.

Application filed April Z5, 1900. Serial No. 14,231. (No model.)

To all whom] t may concern,.-

Beit known that I, JOHN L. HAMMER, a citizen ot' the United States, residing at Chicago, in the county of Cook and State of Illinois,

have invented a certain new and useful Improvement in Core-Making Machines, (Case No. 1,) of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, formro ing a part of this specification.

My invention relates to cores used for foundry purposes, and has for its object the provision of a machine that will produce a completely-constructed core.

i5 IIeret-ofore cores have been made in sections in order that gas-vents might be formed therein. In this way cylindrical cores have been formed in semicylindrical form, the flat faces of the semicylinders being each prozo vided with a longitudinal groove, the grooves serving to form a gas vent or passage when the core-sections were glued together.

By means of my invention the core-body may be formed in an integral Whole, while at the same time the gas-vent may be formed, preferably, as the core-sand is being molded.

In the preferred embodiment of my invention I employ a feeding-screw which may be somewhat analogous to an auger-bit, the feed- 3o ing-screw serving to force sand through a forming-tube from which the nished product issues. The vent hole or passage is preferably formed by means of a vent-former carried upon the end of the feeding-screw ad- 3 5 jacent to the forming-tube, this vent-former being preferably a rod or stem coaxially arranged With the screw. The screw is preferably longitudinally disposed With relation to the forming tube or orifice of the machine, in which case I preferably employ an auxiliary feeding-screw arranged transversely to the main feeding-screw and serving to force sand from a hopper into a chamber containing the main screw.

I will explain my invention more particularly by reference to the accompanying drawings, illustrating the preferred embodiment thereof, in Which- Figure lis an elevation, partially in section, of a machine constructed in accordance with the invention. Fig. 2 is an end elevation of the structure illustrated in Fig. 1. Fig. 3 is an end view of the finished core. Fig. 4 is a longitudinal View of a finished core, partially in section.

Like parts are indicated by similar characters of reference throughout the different iigures.

The portion of the machine that is adapted to contain the core-sand and which is adapt- 6o ed to support the feeding-screws is preferably7 made in halves a a, which may be removably secured together by means of screws passing through lugs b b, provided upon the halves a a. A hopper c is preferably 'vertically ar- 65 ranged, this hopper being preferably provided with ribs d d, that support a bearing e, in which an auxiliary feeding-screwf is journaled to rotate in a horizontal plane. The bearing e is preferably formed in an integral 7o whole, the ribs d d being provided upon onehalf of the hopper. Agitators g g project from the shank of the auxiliary screwf to stir the sand, which would be liable to-stick in the hopper owing to the binding material, usually flour and Water, employed to unite the particles of sand. A main feeding-screw h is preferably horizontally arranged and is contained Within the horizontal sand-channel portion z', that terminates at one end in an 8o orifice that serves to produce u.cores 7i of required cross-section and at the other end in the separated bearings 7l; k, which receive a sleeve l, in the bore of which the shank of the main feeding-screw h is clamped by means of a set-screw m. The separated bearings serve to properly aline the feeding-screw and maintain it in line with the core as it is being finished. Cone or variable-speed pulleys n and o are preferably provided upon the sleeve 9o Zand the shank of the feeding-screw f, respectively. A belt p,that maybe in the form of a rope or cord, may serve to drive the pulleys, and thereby the feeding-screws. A driving-pulley q, preferably driven by a belt r, is mounted, preferably, on the same shaft with a pulley s, the said pulley serving to drive the cord p, and thereby the cone-pulleys n and o. A variable speed is then obtained for the machine by shifting the rope p. I roo have found in actual practice that it is preferable to employ a more dry sand mixture than would ordinarily be employed by the use of core-boxes. The auxiliary screw f thus serves to force the core-sand from the horizontal chamber through the core-forming orifice.

I preferably provide a vent-forming rod u upon the end of the main feeding-screw h and preferably arranged coaxially therewith, the said Vent-former serving to form a Venthole through the cylindrical core as it is being formed. By iXedly securing the ventforming stein u upon the feeding-screw h a perfectly smooth vent-hole is formed in the core, any roughness upon the said stem not aifording a lodgment for the sand, as the stem by rotating prevents the core-sand from sticking into any depressions in the same. Thus a decided improvement is afforded over the devices of the prior art in this respect. The core after being formed may be cut into desired lengths.

In order that one machine may serve to form cores of dilferent sizes, I preferably employ forming-plugs t, that may be removably secured in the mouth of the channel i, a plug having a bore corresponding to the cross-section of the core that it is desired to form being contained within the mouth of the said channel.

It is desirable to have the main feedingscrew substantially equal in diameter to the diameter of the core, so that when the machine is adjusted to produce a core of required size the main feeding-screw is also selected corresponding to the core to b formed.

While l prefer to employ feeding-screws in the manner herein set forth, I do not wish to be limited to the precise means and apparatus herein shown,as modifications may readily be made without departing from the spirit of my invention, and I do not therefore wish to be limited to the precise features of construction shown; but,

Having thus described my invention, I claim as new, and desire to secure by Letters Patent, the following:

In a core-making machine,the combination with a channel portion for containing the core-sand, of a feeding-screw within the said channel portion, and a stem carried upon the end of the feeding-screw adjacent to the exit of the channel portion constituting a passage or vent former, whereby as the sand is forced by the screw through the exit-opening in the channel portion, a veut-passage is provided in the formed core,substantially as described.

In witness whereof I hereunto subscribe my name this 21st day of April, A. D. 1900.

JOI-IN L. HAMMER.

Witnesses:

GEORGE L. CEAGG, CHARLES E. HUBERT. 

